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  2. https://formula.s21g.com/formulae/48676
  3. http://formula.s21g.com/
  4. https://afeq.hatenadiary.org/entry/20100321/1269107565
  5. http://cc.bingj.com/cache.aspx?q=%e5%b9%b3%e5%9d%87%e3%83...